Preparation method of Bi-2212 high-temperature superconductivity wire

Abstract

The invention discloses a preparation method of Bi-2212 high-temperature superconductivity wire, comprising the following steps: firstly, filling superconductivity powder into a pipe; secondly, drawing to process and prepare a secondary compound; thirdly, after drawing the secondary compound, combining the secondary compound with a pure silver rod and a silver alloy rod, and then packing the compound into an AgMn alloy pipe so as to obtain a third compound; fourthly, drawing and processing the third compound into a wire; fifthly, carrying out semi-fused treatment on the wire, and obtaining the Bi-2212 high-temperature superconductivity wire after cooling a furnace. As for the preparation method, the process is simple, the design is reasonable, the manufacturing cost is low, and the application range is wide, and the method can be effectively applied to the preparation process of other relevant superconductivity wires. In the invention, one silver or silver alloy core wire is additionally arranged at the central part of a multi-core wire; therefore, the core wire can be prevented from being broken at the central part of multi-core Bi-2212 wire, the core breakage rate of the wire is obviously reduced, the processing uniformity of the wire is improved, the final uniformity of the wire is improved, and simultaneously the stretching performance of the wire is also improved; and the preparation method is beneficial to the winding of magnet and other applications of superconductivity wire.

Description

technical field [0001] The invention belongs to the technical field of high-temperature superconducting wire preparation, and in particular relates to a preparation method of Bi-2212 high-temperature superconducting wire. Background technique [0002] Since Bi-2212 (Bi 2 Sr 2 CaCu 2 o x ) high-temperature superconductor has excellent low-temperature high-field current-carrying properties, and is the only high-temperature superconducting material that can be prepared into isotropic round wires, making it the first choice for the preparation of low-temperature high-field intercalated coils. [0003] At present, the preparation technology combining powder in tube method (PIT) and melting method is the mainstream technology for preparing high-performance Bi-2212 wire. The technology is to put Bi-2212 powder into a silver tube, prepare a multi-core composite by drawing and assembling, and then process it to the designed wire size, and then melt it at about 900°C to obtain a f...

AI Technical Summary

Problems solved by technology

Drawing processing is the most important technology for preparing wire rods. However, during the drawing process, the tensile stress on the center of the round wire is much greater than that on the edge, which causes the core wire at the center of the wire rod to be easily broken during the processing process. It is difficult to achieve metallurgical bonding between the core wires during the drawing process, which exacerbates the possibility of fracture of the central core wire

Once the core wire in the center is broken, the core breaking phenomenon will gradually expand from the middle to the edge in subsequent processing, resulting in a broken core rate of the final wire generally exceeding 5%, resulting in a decrease in the uniformity of the wire performance, which has become a limit to its large-scale Important reasons to apply